That's a good article, thanks for the link Gary. The table of comparative focal lengths/FOV is really good.... For example, I was able to see at a glance that my 14mm prime gives the same FOV as 21mm on FF, so I can instantly judge that the 24-70 zoom would not replace the wider prime. That shows the need still for a new 20 or 21prime for those of us who can't afford the 15-30.